A new expanded season of Big Brother, which is now going into its 15th season, will debut on Wednesday, June 26 at 9/8c. The series will then air three times a week: Tuesdays at 9/8c, Wednesdays at 9/8c — and then 8/7c, beginning July 17 — and Sundays at 8/7c.

After narrowly escaping cancellation last year, Unforgettable will return for its second season on Sunday, July 28 at 9/8c.

In addition, CBS is premiering two new series this summer. Under the Dome, a 13-episode drama based on Stephen King's best-selling novel and produced by Steven Spielberg's Amblin Entertainment, will launch on Monday, June 24 at 10/9c.